Wild elephants can tell human languages apart!
In Amboseli National Park in Kenya, humans and elephants sometimes come into conflict over resources. While Maasai men will sometimes kill elephants in confrontations over grazing for cattle, Kamba men are less of a threat. When scientists played voice recordings of men from the different tribes, elephants reacted more defensively to the Maasai language because they recognized them as the more threatening tribe.
Since women almost never spear the elephants, the elephants reacted less to recordings of women’s voices. Same thing with young boys’ voices.
Even when the female and male voices were altered to sound like the other gender (females lowered and males raised) the elephants still moved away from the altered male voices but not the altered female voices!
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